The ore-bearing rock is composed mainly of andesitic tuff and tuffite.
作者在赋矿层中首次发现了层状电气石
。
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The word " tough" can also mean simply very difficult – something that causes you problems. You may say see someone spell " tough" (tuff), though to be honest I've never actually seen anyone spell it that way.
" Tough" 这个词也可以简单地表示非常困难——某事让你遇到麻烦。你可能会看到有人拼写" tough" 为" tuff" ,不过说实话,我从未实际见过有人那样拼写。